{"id":"https://data.mapsnap.org/runs/v2.0/iiif/chronoscope/sanborn02558_002.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Alden, Iowa | 1902 | mapsnap generated fit (2026-10-17)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-10-17"},{"label":"run","value":"corpus-v2"},{"label":"pages","value":"5"},{"label":"placed","value":"1"},{"label":"unplaced","value":"4"},{"label":"fit sources","value":"georef 1"},{"label":"key map","value":"none"},{"label":"split sheets","value":"1 sheet(s) cut into 5 panels"},{"label":"unplaced pages","value":"p1__1 (tier 4, 42.51970,-93.37726 +/-100m); p1__3 (tier 4, 42.51970,-93.37726 +/-100m); p1__4 (tier 4, 42.51970,-93.37726 +/-100m); p1__5 (tier 4, 42.51970,-93.37726 +/-100m)"}],"items":[{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025581902:02558_1902-0001__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Alden, Iowa | 1902 | sanborn02558_002 p1 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"},{"label":"confidence","value":"0.58"},{"label":"confidence_provisional","value":"true"},{"label":"confidence_model","value":"corpus-v2"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"6452.0"},{"label":"split_canvas_h","value":"7652.0"}],"created":"2026-10-17T21:50:05Z","modified":"2026-10-17T21:50:05Z","motivation":"georeferencing","target":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025581902:02558_1902-0001__2/selector","type":"SpecificResource","source":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025581902:02558_1902-0001","type":"ImageService3","width":1613,"height":1913},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"272.4,805.0 269.8,805.0 77.4,897.1 48.7,1326.7 328.3,1329.8 394.6,1876.0 1550.5,1867.0 1609.8,1486.3 1597.5,213.0 1578.6,99.1 1325.4,37.6 1153.5,76.0 872.6,37.1 832.7,78.8 828.8,912.9 820.5,981.7 692.6,984.0 692.4,982.9 651.3,808.2 272.4,805.0\" /></svg>"}},"body":{"id":"https://cdn.chronoscope.io/mapsnap/service:gmd:gmd415m:g4154m:g4154am:g025581902:02558_1902-0001__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1329.0,1034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-93.3762602,42.5203668]}},{"type":"Feature","properties":{"resourceCoords":[310.0,1034.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-93.3779055,42.5188779]}}]}}]}